Simulation period: 7 ka BP to 4,5 ka BP (Middle Holocence). The OE1-experiment is carried out using only variations in the orbital forcing between 7 ka BP and 4,5 ka BP (Berger and Loutre 1991). The solar constant has been set to a value of 1365 W/m2 and the greenhouse gas concentrations to 280 ppm (CO2), 700 ppb (CH4) and 265 ppb (N2O), respectively. Initial conditions: The simulation have been initialised at the end of a 500 year spin-down control (quasi-equilibrium) run with constant (orbital, solar and greenhouse gas) forcing for 7 ka BP. Experiment with variable orbital, solar and GHC forcing is also available. Datasets with monthly average values are also available. Technical data to this experiment: The experiment is using ECHO-G: ECHAM4 (f90) + HOPE-G and was run on a NEC-SX (hurrikan).